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Especially if you are removing chlorine (and or chloramine) PRIOR to the membrane, you'd want to go with a TFC element rather than CA.

You said " We just installed the brand new charcoal filter tank etc as mentioned in a previous post. " If you are dechlorinating the feedwater to your RO, then you should not be using CA membranes. Instead you should be using the much more common TFC membranes. If you have specific questions...

Most 4" membranes have male ends, and most housings for the membranes have mating female "ports." Russ